PRETENDED NKW METAL; PALLADIUM. 179 



products, in the above experiments, was fuch as to give the 

 following proportions in the oxide, and the fubnitrate of 

 platina. 



Yellow oxide of platina is compofed of, SnTpamTthe 



Platina ... 87 



Oxigen - - - - I3 



JOO. 

 Subnitrate of platina is compofed of. 



The above oxide of platina - 89 



Nitric acid and water - - - 1 1 



oxide ; 



and of the fub* 

 nitrate. 



100. 



But, in the reduction of this oxide of platina, it became of a 

 green colour ; and remained during forae time in that ftate. 

 Nitrate of platina fometimes becomes of a pale green at the 

 edges, when evaporated to drynefs ; and ammonia affumes a 

 green colour when in holds oxide of platina in folution, as we 

 have feen more particularly with palladium. This, therefore, 

 is a fecond oxide of platina. It contains but feven per cent, 

 of oxigen. 



\ diflblved a known portion of platina in nitro-muriatic acid, 

 and expelled the nitric acid, by pouring in a fufficient quantity 

 of the muriatic; and then evaporated to drynefs. By this expe- 

 riment I learned, that the infoluble muriate of platina is com- 

 pofed of. 



Yellow oxide of platina - - 70 

 Muriatic acid and water - - - 30 



Two oxides of 

 platina ; yellow 

 with 13 per* 

 cent, oxygen ; 

 green with only 

 7 per. cent. 



Compon. parts 

 of infoluble mu- 

 riate of platina ; 



100. 



I then expelled the muriatic acid by the fulphuric, and eva- 

 porated again to drynefs. I found the infoluble fulphate of 

 platina to be compofed of. 



Oxide of platina 

 Acid and water 



54,5 

 45,5 



100,0. 



and of the in- 

 foluble fulphatSi^ 



I 



By much the moft delicate teft for platina is muriate of tin. Munateoftln U 

 A folution of the former, fo pale as hardly to be diilinguiftied f^a^f piatUm! 

 from water, affumes a bright red by a fingle drop of the recenjt 

 muriatic folution of the latter metal. If mercury be prefent, the 

 colour is much darker. Recent muriate of tin, poured into a 

 folution of the muriate formed by the red oxide of mercury, 



N 2 * converts 



